Cannot find an key aggName in name – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.4-8.9

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Briefly, this error occurs when Elasticsearch is unable to locate a specified aggregation key in a given index or document. This could be due to a typo in the aggregation name, or the aggregation might not exist in the specified index. To resolve this issue, you can verify the aggregation name and ensure it exists in the specified index. If the aggregation doesn’t exist, you may need to create it. Also, ensure that the correct index is being queried.

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This guide will help you check for common problems that cause the log ” Cannot find an key [” + aggName + “] in [” + name + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, aggregations.

Log Context

Log “Cannot find an key [” + aggName + “] in [” + name + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (bucket.getKeyAsString().equals(aggName.substring(1; aggName.length() - 1))) {
 return bucket.getProperty(name; path.subList(1; path.size()));
 // No key match; time to give up
 throw new InvalidAggregationPathException("Cannot find an key [" + aggName + "] in [" + name + "]");
 }  Object[] propertyArray = new Object[buckets.size()];
 for (int i = 0; i < buckets.size(); i++) {
 propertyArray[i] = buckets.get(i).getProperty(name; path);


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